Meeting Request With Webform submissions

Hello,

I'm not sure if I m allowed to post it here, but I would like an answer, and I m not sure "drupal answer" could help me...

So...

I'm trying to send meeting request to user after they submit a webform.

In this webform, they can fill in a start date and stop date (for exemple).

And I would like to get the value of start date in the webform to use it in my meeting request.

I can send this meeting request with the code below:

function sendIcalEvent($from_name, $from_address, $to_name, $to_address,     $startTime, $endTime, $subject, $description, $location)
{
$domain = 'domain.tld';

//Create Email Headers
$mime_boundary = "----Meeting Booking----".MD5(TIME());

$headers = "From: ".$from_name." <".$from_address.">\n";
$headers .= "Reply-To: ".$from_name." <".$from_address.">\n";
$headers .= "MIME-Version: 1.0\n";
$headers .= "Content-Type: multipart/alternative; boundary=\"$mime_boundary\"\n";
$headers .= "Content-class: urn:content-classes:calendarmessage\n";

//Create Email Body (HTML)
$message = "--$mime_boundary\r\n";
$message .= "Content-Type: text/html; charset=UTF-8\n";
$message .= "Content-Transfer-Encoding: 8bit\n\n";
$message .= "<html>\n";
$message .= "<body>\n";
$message .= '<p>'.$description.'</p>';
$message .= "</body>\n";
$message .= "</html>\n";
$message .= "--$mime_boundary\r\n";

$ical = 'BEGIN:VCALENDAR' . "\r\n" .
'PRODID:-//Microsoft Corporation//Outlook 10.0 MIMEDIR//EN' . "\r\n" .
'VERSION:2.0' . "\r\n" .
'METHOD:REQUEST' . "\r\n" .
'BEGIN:VTIMEZONE' . "\r\n" .
'TZID:Romance Standard Time' . "\r\n" .
'BEGIN:STANDARD' . "\r\n" .
'DTSTART:16011028T030000' . "\r\n" .
'RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=1SU;BYMONTH=11' . "\r\n" .
'TZOFFSETFROM:+0200' . "\r\n" .
'TZOFFSETTO:+0100' . "\r\n" .
'TZNAME:Romance Standard Time' . "\r\n" .
'END:STANDARD' . "\r\n" .
'BEGIN:DAYLIGHT' . "\r\n" .
'DTSTART:16010325T020000' . "\r\n" .
'RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=2SU;BYMONTH=3' . "\r\n" .
'TZOFFSETFROM:+0200' . "\r\n" .
'TZOFFSETTO:+0100' . "\r\n" .
'TZNAME:EDST' . "\r\n" .
'END:DAYLIGHT' . "\r\n" .
'END:VTIMEZONE' . "\r\n" .  
'BEGIN:VEVENT' . "\r\n" .
'ORGANIZER;CN="'.$from_name.'":MAILTO:'.$from_address. "\r\n" .
'ATTENDEE;CN="'.$to_name.'";ROLE=REQ-PARTICIPANT;RSVP=TRUE:MAILTO:'.$to_address. "\r\n" .
'LAST-MODIFIED:' . date("Ymd\TGis") . "\r\n" .
'UID:'.date("Ymd\TGis", strtotime($startTime)).rand()."@".$domain."\r\n" .
'DTSTAMP:'.date("Ymd\TGis"). "\r\n" .
'DTSTART;TZID="Romance Standard Time":'.date("Ymd\THis", strtotime($startTime)). "\r\n" .
'DTEND;TZID="Romance Standard Time":'.date("Ymd\THis", strtotime($endTime)). "\r\n" .
'TRANSP:OPAQUE'. "\r\n" .
'SEQUENCE:1'. "\r\n" .
'SUMMARY:' . $subject . "\r\n" .
'LOCATION:' . $location . "\r\n" .
'CLASS:PUBLIC'. "\r\n" .
'PRIORITY:5'. "\r\n" .
'BEGIN:VALARM' . "\r\n" .
'TRIGGER:-PT15M' . "\r\n" .
'ACTION:DISPLAY' . "\r\n" .
'DESCRIPTION:Reminder' . "\r\n" .
'END:VALARM' . "\r\n" .
'END:VEVENT'. "\r\n" .
'END:VCALENDAR'. "\r\n";
$message .= 'Content-Type: text/calendar;name="meeting.ics";method=REQUEST'."\n";
$message .= "Content-Transfer-Encoding: 8bit\n\n";
$message .= $ical;

$mailsent = mail($to_address, $subject, $message, $headers);

return ($mailsent)?(true):(false);
}
$from_name = "webmaster";        
$from_address = "webmaster@domain.tld";        
$to_name = "Name";        
$to_address = "user@domain.tld";        
$startTime = $date;        
$endTime = "07/01/2015 02:00";        
$subject = "Test Subject";        
$description = "description";       
$location = "FlowLine";
sendIcalEvent($from_name, $from_address, $to_name, $to_address,$startTime,$endTime, $subject, $description, $location);

So I use this code in my confirmation page.

BUT I would like that startime = [submission:values:date]... (date is a webform field name)

How can I make it possible? Maybe using the confirmation page is not the wright way...

I am not a developer, I would like to modify the webform code the less I can.

Regards,